Deleting rows

Hi there,
can you help me?
I'm trying to delete rows in a single table.
When i exec select , rows returne are 6098 (right number)
SELECT distinct FLD_USERID FROM
(
SELECT distinct FLD_USERID, MIN(FLD_LEVEL)as a
FROM TBL_CHARACTERbackup
GROUP BY FLD_USERID
HAVING (COUNT(*) > 2)
) f
When i try to delete that records rows deleted are 13708 (wrong)
DELETE TBL_CHARACTERbackup WHERE FLD_USERID IN
(
SELECT distinct FLD_USERID FROM
(
SELECT distinct FLD_USERID, MIN(FLD_LEVEL)as a
FROM TBL_CHARACTERbackup
GROUP BY FLD_USERID
HAVING (COUNT(*) > 2)
) f
)
Donno why, please help
TksThe DELETE statement will delete every row in your table which has a
FLD_USERID value that is duplicated, whereas the SELECT will only show
ONE row per FLD_USERID.
Possibly this is what you intended:
DELETE FROM TBL_CHARACTERbackup
WHERE EXISTS
(SELECT *
FROM TBL_CHARACTERbackup AS T
WHERE T.fld_userid = TBL_CHARACTERbackup.fld_userid
AND T.fld_level < TBL_CHARACTERbackup.fld_level)
but that's only a guess.
David Portas
SQL Server MVP
--|||
"David Portas" ha scritto:

> The DELETE statement will delete every row in your table which has a
> FLD_USERID value that is duplicated, whereas the SELECT will only show
> ONE row per FLD_USERID.
> Possibly this is what you intended:
> DELETE FROM TBL_CHARACTERbackup
> WHERE EXISTS
> (SELECT *
> FROM TBL_CHARACTERbackup AS T
> WHERE T.fld_userid = TBL_CHARACTERbackup.fld_userid
> AND T.fld_level < TBL_CHARACTERbackup.fld_level)
> but that's only a guess.
> --
> David Portas
> SQL Server MVP
Ok what i need is to delete all fld_userid with lower fld_level
just to have
only one records for each fld_userid with highest fld_level
How can i do?
Please help.
> --
>|||You haven't told us what the key of your table is. Assuming
(fld_userid, fld_level) is unique then just turn around the sign in my
first attempt:
DELETE FROM TBL_CHARACTERbackup
WHERE EXISTS
(SELECT *
FROM TBL_CHARACTERbackup AS T
WHERE T.fld_userid = TBL_CHARACTERbackup.fld_userid
AND T.fld_level > TBL_CHARACTERbackup.fld_level)
(still untested)
If (fld_userid, fld_level) isn't unique that means there may be more
than one row with the same maximum value of fld_level so you will have
to add some other criteria to the WHERE clause. If you need more help
then the following article explains the best way to describe the
details of your problem for the group:
http://www.aspfaq.com/etiquette.asp?id=5006
Do you have any say over naming conventions in your design? Why the
useless tbl_ and fld_ prefixes? They tell us nothing (we know what
tables and columns are) and just make the names harder to read. Also,
the usual convention is to use the term "column" not "field" when
referring to relational data. Some people find this distinction more
important than others and associate the two terms with totally
different concepts but almost everyone loathes to see prefixes on
column names.
Hope this helps.
David Portas
SQL Server MVP
--|||
"David Portas" wrote:

> You haven't told us what the key of your table is. Assuming
> (fld_userid, fld_level) is unique then just turn around the sign in my
> first attempt:
> DELETE FROM TBL_CHARACTERbackup
> WHERE EXISTS
> (SELECT *
> FROM TBL_CHARACTERbackup AS T
> WHERE T.fld_userid = TBL_CHARACTERbackup.fld_userid
> AND T.fld_level > TBL_CHARACTERbackup.fld_level)
> (still untested)
> If (fld_userid, fld_level) isn't unique that means there may be more
> than one row with the same maximum value of fld_level so you will have
> to add some other criteria to the WHERE clause. If you need more help
> then the following article explains the best way to describe the
> details of your problem for the group:
> http://www.aspfaq.com/etiquette.asp?id=5006
> Do you have any say over naming conventions in your design? Why the
> useless tbl_ and fld_ prefixes? They tell us nothing (we know what
> tables and columns are) and just make the names harder to read. Also,
> the usual convention is to use the term "column" not "field" when
> referring to relational data. Some people find this distinction more
> important than others and associate the two terms with totally
> different concepts but almost everyone loathes to see prefixes on
> column names.
> Hope this helps.
> --
> David Portas
> SQL Server MVP
I'll explain :
each row_USERID corrisponds more records
ex
FLD_USERID FLD_LEVEL CHARACTERS
daniele 1 PIPPO
daniele 27 PLUTO
daniele 37 Paperino
I must keep in table
FLD_USERID FLD_LEVEL CHARACTERS
daniele 27 PLUTO
daniele 37 Paperino
That means only 2 records for FLD_USERID wiyh 2 higher FLD_LEVEL levels
Please help
> --
>|||Try:
DELETE FROM TBL_CHARACTERbackup
WHERE fld_level =
(SELECT MIN(fld_level)
FROM TBL_CHARACTERbackup AS T
WHERE fld_userid = TBL_CHARACTERbackup.fld_userid)
David Portas
SQL Server MVP
--